POJ 3259——Wormholes——————【最短路、SPFA、判负环】

【POJ 3259——Wormholes——————【最短路、SPFA、判负环】】的更多相关文章

解题报告：poj 3259 Wormholes（入门spfa判断负环）

Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a time that is BEFORE you entered the wormhole! Eac…

POJ 3259 Wormholes（最短路径，求负环）

POJ 3259 Wormholes(最短路径,求负环) Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its destination at a time that is BEFORE…

POJ——1364King（差分约束SPFA判负环+前向星）

King Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 11946 Accepted: 4365 Description Once, in one kingdom, there was a queen and that queen was expecting a baby. The queen prayed: ``If my child was a son and if only he was a sound kin…

bzoj 1715: [Usaco2006 Dec]Wormholes 虫洞【spfa判负环】

tag是假的,用了及其诡异的方法判负环正权无向边和负权有向边的图 #include<iostream> #include<cstdio> #include<cstring> using namespace std; const int N=505,inf=210000000; int n,m,w,h[N],cnt,d[N]; struct qwe { int ne,to,va; }e[N*N]; int read() { int r=0,f=1; char p=get…

POJ 3259 Wormholes(SPFA判负环)

题目链接:http://poj.org/problem?id=3259 题目大意是给你n个点,m条双向边,w条负权单向边.问你是否有负环(虫洞). 这个就是spfa判负环的模版题,中间的cnt数组就是记录这个点松弛进队的次数,次数超过点的个数的话,就说明存在负环使其不断松弛. #include <iostream> #include <cstdio> #include <cstring> #include <queue> using namespace st…

Poj 3259 Wormholes（spfa判负环）

Wormholes Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 42366 Accepted: 15560 传送门 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…